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I <br /> I I Y J <br /> 1 f <br />' 1 4 � <br /> 1 02 November 2004 <br /> . AGE-NC Project No 98-0465 ,1 ` <br /> Page 2 of 4 _ <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ti <br /> Water samples were collected from each monitoring well using dedicated,disposable plastic bailers <br /> after allowing'the well to achieve a minimum 80% recovery of the pre-purge water volume The <br />' samples from each well were transferred into three 40-milliliter(ml)volatile organic analysis(VOA) <br /> vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative and one I-liter' <br />' amber bottle without preservative The samples were labeled with the monitoring well designation, <br /> date,time of sampling, and the sampler's initials and transported in a chilled container under chain <br /> of custody to Cal Tech Environmental Laboratories (CTEL), a Department of Health Services- <br /> certified analytic a1_laboratory,' for analysis The samples were analyzed for <br /> I <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH=g) and diesel (TPH-d) in <br />' accordance with EPA Method 8015-modified, <br /> • Volatile aromatic compounds benzene, toluene, 'ethylbenzene, and xylenes (BTEX) in <br /> 1accordance with EPA Method 8260B, and <br /> • Fuel oxygenates methyl tertiary-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl <br /> tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME),and tertiary butanol(TBA) <br /> • in accordance with EPA Method 8260B, and <br /> • Fuel scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA Method 826013 <br /> J <br />' I 3.0. FINDINGS <br />' Ground water elevation and flow direction were inferred from field data collected on 15 July 2004, <br /> hydrocarbon impact to ground water was quantified by laboratory analysis of the ground water <br /> samples ' <br /> t <br /> J 1 L 1 <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Sj J t <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> depth to groundwater from the surveyed relative casing elevations(Table' 11) Depths to ground water averaged about 11 87 feet below surface grade(bsg) Ground water elevations at the site ranged from <br /> 8 62,feet(MW-4) to 8 79 feet(MW-2)below mean sea level(MSL) During this monitoring event, <br /> the ground water elevations were within the screened intervals of the wells Figure 3 illustrates the n <br />' contoured ground water elevations as measured on 15 July 2004 <br /> • yl <br /> ' 1 I <br /> I � I Advanced GeoEnvironmental,Inc <br /> i r 1 <br /> II <br /> 1 3 ` <br /> Jt 1 _ <br />